Which India post zone has released a Special Postal Cover dedicated to migrant workers?

In a bid to tribute migrant workers, India post, Mumbai has released a Special Postal Cover dedicated to migrant workers at the Bicentennial Hall of the historic ,Mumbai, Maharashtra. The five migrant workers from different sectors such as two from construction sector, a taxi driver, a jewelry craftsman and a tailor were called to release the postal cover. India post, Department of Posts (DoP), which comes under the Ministry of Communications, headquartered in New Delhi.